I've moderated communities, I've seen first-hand effective and ineffective moderation, including honest mistakes and powertrippers. Each imageboard fosters a different feeling. Some don't want politics. Some want to be chaotic, like /b/ was. The grammar ban makes me suspect is was a certain /a/ site (I forget the name) which autobans for that. I'm not sure why, maybe the owner is autistic. The other two are hard to judge without more context. It's easy to misinterpret sarcasm so a positive response, or in fact any response, to an illegal thread is fair game to ban (especially if you bumped the damn thing). It's a liability for their hosting provider. But again, it could just be shipty moderation or a moderation style that doesn't want your posts. Not all imageboards want eberryone. Is /comfy/ scaredy for banning politics? Maybe so, but that's a good thing for its community.
You might be surprised at how left-wing 4chan originally was (Bush era) and how many women were there. Most of the far-right stuff was edgy chemo, stormfags weren't welcome and were eventually put into a containment board just like the bronies were. The thing is that that 4chan originally
had an effective anon culture where if you admitted who you were (black, white, male, female, gay, straight, whatever), you were flamed for it. In most IB communities, no-one should know or care as it just distracts from the thread. Poor moderation and rapid growth destroyed that.
The issue isn't that these people are left-wing, right-wing or women. The issue is that they made it clear
they were left-wing, right-wing or women and that this was accepted by moderators and the community. A good moderator publicly shames both sides
, because irrelevant politics ruins communities. Both sides lament the rise of the other side on imageboards (right/pol/ complaining leftists are invading eberrywhere, while being the most popular boards on many imageboards including 4chan, 8chan and anon.cafe and frequently bringing up their politics outside their board, like the annoying type of vegan).
note to mod: if you feel this will start a political debate, delete it.